bpf, sockmap: Fix sk_redir use-after-free in send verdict
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix sk_redir use-after-free in send verdict sk_psock_msg_verdict() takes a socket reference for psock->sk_redir. tcp_bpf_send_verdict() copies that pointer while holding the source socket lock, but does not take a reference for the local copy before dropping the lock around tcp_bpf_sendmsg_redir(). When apply_bytes keeps the cached verdict active, another sendmsg() on the same source socket can consume the remaining bytes and release the cached reference while the first thread still holds only the raw local pointer: CPU 0 CPU 1 sk_redir = psock->sk_redir apply_bytes remains nonzero release_sock(sk) lock_sock(sk) apply_bytes reaches zero psock->sk_redir = NULL release_sock(sk) tcp_bpf_sendmsg_redir(sk_redir) sock_put(sk_redir) tcp_bpf_sendmsg_redir(sk_redir) The final sock_put() can free sk_redir before CPU 0 dereferences it. KASAN reported: BUG: KASAN: slab-use-after-free in tcp_bpf_sendmsg_redir+0xf39/0x1020 Read of size 8 at addr ffff888108537090 by task poc/87 Call Trace: tcp_bpf_sendmsg_redir+0xf39/0x1020 tcp_bpf_sendmsg+0x977/0x1a50 __sys_sendto+0x32c/0x3a0 __x64_sys_sendto+0xdb/0x1b0 Allocated by task 85: sk_prot_alloc+0x56/0x210 sk_clone+0x6f/0x14b0 inet_csk_clone_lock+0x24/0x740 tcp_create_openreq_child+0x25/0x2710 tcp_v4_syn_recv_sock+0x10a/0xe00 Freed by task 0: __kasan_slab_free+0x43/0x70 slab_free_after_rcu_debug+0xa6/0x1e0 rcu_core+0x50a/0x1850 Last potentially related work creation
CVE-2026-74589
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74589
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "41b7da0cb72ca5aa1e62b68dab323d0791fc6bdf",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "9b4fbc371a6ecf1b4e43b5a629015cc0830d8de3",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "90a19b0894ba79a699b48cf44421b36fbd566e99",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "d192cff2a37d59206dabe6ec2e60ceac6271f274",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "4c9d9aa809c261dc0490a0e19d675f7e8e4c85bf",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "a14e4ef1d90c3418f01b3b6b8fd3a40a0a208a10",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "1cec526cf0a2227395f2c2f4b671cb052ff0b00e",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "a76624733730e541e4955fdecf506af2f6b20558",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/tcp_bpf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/tcp_bpf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74589
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33226 · Revision 1
- Added to Heist Feed
- Publisher date