Vulnerability-Lookup

alsa-2026:36645

Vulnerability from osv_almalinux

Published

2026-07-08 00:00

Modified

2026-07-09 11:24

Summary

Important: kernel update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating
system.

Security Fix(es):

kernel: eventpoll: defer struct eventpoll free to RCU grace period

(CVE-2026-43074)

kernel: eventpoll: fix ep_remove struct eventpoll / struct file UAF

(CVE-2026-46242)

kernel: Linux kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266)

Bug Fix(es) and Enhancement(s):

kernel: Linux kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite [almalinux-9.8.z] (JIRA:AlmaLinux-182344)
[AlmaLinux 9] Bonding reports unknown speed/duplex for tg3 interface [almalinux-9.8.z] (JIRA:AlmaLinux-182768)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:36645	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-43074	REPORT
	https://access.redhat.com/security/cve/CVE-2026-46242	REPORT
	https://access.redhat.com/security/cve/CVE-2026-53266	REPORT
	https://bugzilla.redhat.com/2467019	REPORT
	https://bugzilla.redhat.com/2483519	REPORT
	https://bugzilla.redhat.com/2485368	REPORT
	https://errata.almalinux.org/9/ALSA-2026-36645.html	ADVISORY

JSON

To clipboard

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  ],
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating  \nsystem.  \n\nSecurity Fix(es):  \n\n  * kernel: eventpoll: defer struct eventpoll free to RCU grace period\n\n\n(CVE-2026-43074)  \n\n  * kernel: eventpoll: fix ep_remove struct eventpoll / struct file UAF\n\n\n(CVE-2026-46242)  \n\n  * kernel: Linux kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * kernel: Linux kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite [almalinux-9.8.z] (JIRA:AlmaLinux-182344)\n  * [AlmaLinux 9] Bonding reports unknown speed/duplex for tg3 interface [almalinux-9.8.z] (JIRA:AlmaLinux-182768)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:36645",
  "modified": "2026-07-09T11:24:42Z",
  "published": "2026-07-08T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:36645"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43074"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-46242"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-53266"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467019"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2483519"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2485368"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-36645.html"
    }
  ],
  "related": [
    "CVE-2026-43074",
    "CVE-2026-46242",
    "CVE-2026-53266"
  ],
  "summary": "Important: kernel update"
}

CVE-2026-43074 (GCVE-0-2026-43074)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:21 – Updated: 2026-06-01 16:14

Title

eventpoll: defer struct eventpoll free to RCU grace period

Summary

In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/902120be4f44947df…
https://git.kernel.org/stable/c/a6d57084372161f86…
https://git.kernel.org/stable/c/a6566cd33f6f967a7…
https://git.kernel.org/stable/c/5b1173b165421561d…
https://git.kernel.org/stable/c/7e8083f5eeedab0f4…
https://git.kernel.org/stable/c/ae0bb9c1fb7c25945…
https://git.kernel.org/stable/c/07712db80857d5d09…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f2451def095c1743adcfcb0cb5dadc86034e162a , < 902120be4f44947df6311002addc7faf69bdbff1 (git) Affected: a1f93804449d13f97dabd4b996817de4bf1ed67a , < a6d57084372161f86660bc4607784420e00efe2c (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < a6566cd33f6f967a7651ebf2ce0dd31572e319cf (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 5b1173b165421561db29f30afc7e97d940a398a9 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 7e8083f5eeedab0f460063b9c2c14c9a4e71a427 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 07712db80857d5d09ae08f3df85a708ecfc3b61f (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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CVE-2026-46242 (GCVE-0-2026-46242)

Vulnerability from cvelistv5 – Published: 2026-05-30 12:13 – Updated: 2026-07-09 00:31

Title

eventpoll: fix ep_remove struct eventpoll / struct file UAF

Summary

In the Linux kernel, the following vulnerability has been resolved: eventpoll: fix ep_remove struct eventpoll / struct file UAF ep_remove() (via ep_remove_file()) cleared file->f_ep under file->f_lock but then kept using @file inside the critical section (is_file_epoll(), hlist_del_rcu() through the head, spin_unlock). A concurrent __fput() taking the eventpoll_release() fastpath in that window observed the transient NULL, skipped eventpoll_release_file() and ran to f_op->release / file_free(). For the epoll-watches-epoll case, f_op->release is ep_eventpoll_release() -> ep_clear_and_put() -> ep_free(), which kfree()s the watched struct eventpoll. Its embedded ->refs hlist_head is exactly where epi->fllink.pprev points, so the subsequent hlist_del_rcu()'s "*pprev = next" scribbles into freed kmalloc-192 memory. In addition, struct file is SLAB_TYPESAFE_BY_RCU, so the slot backing @file could be recycled by alloc_empty_file() -- reinitializing f_lock and f_ep -- while ep_remove() is still nominally inside that lock. The upshot is an attacker-controllable kmem_cache_free() against the wrong slab cache. Pin @file via epi_fget() at the top of ep_remove() and gate the critical section on the pin succeeding. With the pin held @file cannot reach refcount zero, which holds __fput() off and transitively keeps the watched struct eventpoll alive across the hlist_del_rcu() and the f_lock use, closing both UAFs. If the pin fails @file has already reached refcount zero and its __fput() is in flight. Because we bailed before clearing f_ep, that path takes the eventpoll_release() slow path into eventpoll_release_file() and blocks on ep->mtx until the waiter side's ep_clear_and_put() drops it. The bailed epi's share of ep->refcount stays intact, so the trailing ep_refcount_dec_and_test() in ep_clear_and_put() cannot free the eventpoll out from under eventpoll_release_file(); the orphaned epi is then cleaned up there. A successful pin also proves we are not racing eventpoll_release_file() on this epi, so drop the now-redundant re-check of epi->dying under f_lock. The cheap lockless READ_ONCE(epi->dying) fast-path bailout stays.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/2de4db145b2992da4…
https://git.kernel.org/stable/c/9324de74a3a59b9fd…
https://git.kernel.org/stable/c/ef4ca02e95363e789…
https://git.kernel.org/stable/c/ced39b6a8062bac5c…
https://git.kernel.org/stable/c/a6dc643c69311677c…
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 2de4db145b2992da496fea6c51f9839be678ae24 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 9324de74a3a59b9fde9b62ee45ebaa71458ba2e5 (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < ef4ca02e95363e78977ca04340d44fe3b4b2b81f (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < ced39b6a8062bac5c18a1c3df85634107eb8664a (git) Affected: 58c9b016e12855286370dfb704c08498edbc857a , < a6dc643c69311677c574a0f17a3f4d66a5f3744b (git) Affected: f2451def095c1743adcfcb0cb5dadc86034e162a (git) Affected: a1f93804449d13f97dabd4b996817de4bf1ed67a (git) Affected: 5.15.209 , < 5.16 (semver) Affected: 6.1.175 , < 6.2 (semver)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventpoll: fix ep_remove struct eventpoll / struct file UAF\n\nep_remove() (via ep_remove_file()) cleared file-\u003ef_ep under\nfile-\u003ef_lock but then kept using @file inside the critical section\n(is_file_epoll(), hlist_del_rcu() through the head, spin_unlock).\nA concurrent __fput() taking the eventpoll_release() fastpath in\nthat window observed the transient NULL, skipped\neventpoll_release_file() and ran to f_op-\u003erelease / file_free().\n\nFor the epoll-watches-epoll case, f_op-\u003erelease is\nep_eventpoll_release() -\u003e ep_clear_and_put() -\u003e ep_free(), which\nkfree()s the watched struct eventpoll. Its embedded -\u003erefs\nhlist_head is exactly where epi-\u003efllink.pprev points, so the\nsubsequent hlist_del_rcu()\u0027s \"*pprev = next\" scribbles into freed\nkmalloc-192 memory.\n\nIn addition, struct file is SLAB_TYPESAFE_BY_RCU, so the slot\nbacking @file could be recycled by alloc_empty_file() --\nreinitializing f_lock and f_ep -- while ep_remove() is still\nnominally inside that lock. The upshot is an attacker-controllable\nkmem_cache_free() against the wrong slab cache.\n\nPin @file via epi_fget() at the top of ep_remove() and gate the\ncritical section on the pin succeeding. With the pin held @file\ncannot reach refcount zero, which holds __fput() off and\ntransitively keeps the watched struct eventpoll alive across the\nhlist_del_rcu() and the f_lock use, closing both UAFs.\n\nIf the pin fails @file has already reached refcount zero and its\n__fput() is in flight. Because we bailed before clearing f_ep,\nthat path takes the eventpoll_release() slow path into\neventpoll_release_file() and blocks on ep-\u003emtx until the waiter\nside\u0027s ep_clear_and_put() drops it. The bailed epi\u0027s share of\nep-\u003erefcount stays intact, so the trailing ep_refcount_dec_and_test()\nin ep_clear_and_put() cannot free the eventpoll out from under\neventpoll_release_file(); the orphaned epi is then cleaned up\nthere.\n\nA successful pin also proves we are not racing\neventpoll_release_file() on this epi, so drop the now-redundant\nre-check of epi-\u003edying under f_lock. The cheap lockless\nREAD_ONCE(epi-\u003edying) fast-path bailout stays."
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CVE-2026-53266 (GCVE-0-2026-53266)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:41

Title

netfilter: bridge: make ebt_snat ARP rewrite writable

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is intentional: at the bridge ebtables hooks the Ethernet header is addressed through skb_mac_header()/eth_hdr(), while skb->data points at the Ethernet payload. Asking skb_ensure_writable() for ETH_HLEN bytes would check the payload, not the Ethernet header, and would reintroduce the small packet regression fixed by commit 63137bc5882a. However, the optional ARP sender hardware address rewrite is different. It writes through skb_store_bits() at an offset relative to skb->data: skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN) skb_header_pointer() only safely reads the ARP header; it does not make the later sender hardware address range writable. If that range is still held in a nonlinear skb fragment backed by a splice-imported file page, skb_store_bits() maps the frag page and copies the new MAC address directly into it. Ensure the ARP SHA range is writable before reading the ARP header and before calling skb_store_bits().

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/bf84ad7c7a9ede46e…
https://git.kernel.org/stable/c/76280b78cc9f23bdc…
https://git.kernel.org/stable/c/b7e91939ba9be805a…
https://git.kernel.org/stable/c/afd64b59c3de9bbbd…
https://git.kernel.org/stable/c/153ea96c806aea395…
https://git.kernel.org/stable/c/b18675263db1147c8…
https://git.kernel.org/stable/c/c9b5ff59feffb92a1…
https://git.kernel.org/stable/c/67ba971ae02514d85…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 76280b78cc9f23bdc6438e10ad6dff148ef8375b (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < b7e91939ba9be805a62a257fa4e227dffbb88fa0 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < afd64b59c3de9bbbdd3759e834fdc55cda716e0b (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 153ea96c806aea395daba907a4f88480b6ad5093 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < b18675263db1147c8e1cab625400c13a0d87bd2d (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 67ba971ae02514d85818fe0c32549ab4bfa3bf49 (git) Affected: 2f3839075a5f8dcf116c1abe35b36b018ac62445 (git) Affected: 51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b (git) Affected: b7d23c2c87584eb429f115c078ed511be8b18e29 (git) Affected: 5.4.73 , < 5.5 (semver) Affected: 5.8.17 , < 5.9 (semver) Affected: 5.9.2 , < 5.10 (semver)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb-\u003edata points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb-\u003edata:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info-\u003emac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:41:09.601Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
        },
        {
          "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
        },
        {
          "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
        }
      ],
      "title": "netfilter: bridge: make ebt_snat ARP rewrite writable",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53266",
    "datePublished": "2026-06-25T08:39:53.190Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-06-28T06:41:09.601Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

alsa-2026:36645

Vulnerability from osv_almalinux

CVE-2026-43074 (GCVE-0-2026-43074)

CVE-2026-46242 (GCVE-0-2026-46242)

CVE-2026-53266 (GCVE-0-2026-53266)

Tags

Sightings

Nomenclature